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#pragma once
// 3-plane planar YUV. Two flavours:
//
// PlanarSource / PlanarSink — YUV/YVU 420/422/444, single Y per word,
// single chroma per word. Chroma is averaged over h_sub × v_sub
// on write.
//
// MultiPixelPlanarSource / MultiPixelPlanarSink — T430, multi-pixel-
// per-word planar 4:4:4 (3 samples per uint32_t in each of 3
// planes, plus 2-bit X padding). block_w = ppw, block_h = 1.
//
// Plane indices for Y / U / V are looked up via Layout::find_plane<C>(),
// so swap_uv layouts (YVU vs YUV) work without separate templates.
#include <array>
#include "../layout.h"
#include "detail.h"
namespace pixpat
{
template <typename L>
struct PlanarSource {
using Layout = L;
using Pixel = YUV16;
static_assert(L::kind == ColorKind::YUV);
static_assert(L::num_planes == 3);
static constexpr size_t y_plane = L::template find_plane<C::Y>();
static constexpr size_t u_plane = L::template find_plane<C::U>();
static constexpr size_t v_plane = L::template find_plane<C::V>();
using YP = typename L::template plane<y_plane>;
using UP = typename L::template plane<u_plane>;
using VP = typename L::template plane<v_plane>;
static YUV16 read(const Buffer<3>& buf, size_t x, size_t y,
[[maybe_unused]] size_t W,
[[maybe_unused]] size_t H) noexcept
{
const uint8_t* yp = buf.data[y_plane] + y * buf.stride[y_plane]
+ x * YP::bytes_per_pixel;
const auto y_vals = YP::unpack(detail::load_word<YP>(yp));
const size_t cx = x / L::h_sub;
const size_t cy = y / L::v_sub;
const uint8_t* up = buf.data[u_plane] + cy * buf.stride[u_plane]
+ cx * UP::bytes_per_pixel;
const uint8_t* vp = buf.data[v_plane] + cy * buf.stride[v_plane]
+ cx * VP::bytes_per_pixel;
const auto u_vals = UP::unpack(detail::load_word<UP>(up));
const auto v_vals = VP::unpack(detail::load_word<VP>(vp));
return YUV16{
detail::decode_norm(YP::comps[0].bits, y_vals[0]),
detail::decode_norm(UP::comps[0].bits, u_vals[0]),
detail::decode_norm(VP::comps[0].bits, v_vals[0]),
uint16_t(0),
};
}
};
template <typename L>
struct PlanarSink {
using Layout = L;
using Pixel = YUV16;
static_assert(L::kind == ColorKind::YUV);
static_assert(L::num_planes == 3);
static constexpr size_t y_plane = L::template find_plane<C::Y>();
static constexpr size_t u_plane = L::template find_plane<C::U>();
static constexpr size_t v_plane = L::template find_plane<C::V>();
using YP = typename L::template plane<y_plane>;
using UP = typename L::template plane<u_plane>;
using VP = typename L::template plane<v_plane>;
static constexpr size_t block_h = L::v_sub;
static constexpr size_t block_w = L::h_sub;
static void write_block(Buffer<3>& buf, size_t bx, size_t by,
const YUV16 (&block)[block_h][block_w]) noexcept
{
// Y per pixel.
for (size_t dy = 0; dy < block_h; ++dy) {
uint8_t* y_row = buf.data[y_plane]
+ (by + dy) * buf.stride[y_plane];
for (size_t dx = 0; dx < block_w; ++dx) {
std::array<uint16_t, YP::num_comps> v{};
v[0] = detail::encode_norm(YP::comps[0].bits, block[dy][dx].y);
detail::store_word<YP>(
y_row + (bx + dx) * YP::bytes_per_pixel,
YP::pack(v));
}
}
// One averaged U and V sample per block. Integer truncation
// (no round-half-up).
uint32_t u_sum = 0, v_sum = 0;
for (size_t dy = 0; dy < block_h; ++dy) {
for (size_t dx = 0; dx < block_w; ++dx) {
u_sum += block[dy][dx].u;
v_sum += block[dy][dx].v;
}
}
constexpr uint32_t n = block_h * block_w;
const size_t cx = bx / L::h_sub;
const size_t cy = by / L::v_sub;
std::array<uint16_t, UP::num_comps> uw{};
uw[0] = detail::encode_norm(UP::comps[0].bits, uint16_t(u_sum / n));
detail::store_word<UP>(
buf.data[u_plane] + cy * buf.stride[u_plane]
+ cx * UP::bytes_per_pixel,
UP::pack(uw));
std::array<uint16_t, VP::num_comps> vw{};
vw[0] = detail::encode_norm(VP::comps[0].bits, uint16_t(v_sum / n));
detail::store_word<VP>(
buf.data[v_plane] + cy * buf.stride[v_plane]
+ cx * VP::bytes_per_pixel,
VP::pack(vw));
}
};
// T430-style 3-plane multi-pixel-per-word planar 4:4:4. Each plane has
// `ppw` samples of the same component (Y in plane 0, U in 1, V in 2 —
// or whichever ordering find_plane resolves) packed into a single
// storage word. block_w = ppw, block_h = 1. No chroma subsampling.
template <typename L>
struct MultiPixelPlanarSource {
using Layout = L;
using Pixel = YUV16;
static_assert(L::kind == ColorKind::YUV);
static_assert(L::num_planes == 3);
static_assert(L::h_sub == 1 && L::v_sub == 1);
static constexpr size_t y_plane = L::template find_plane<C::Y>();
static constexpr size_t u_plane = L::template find_plane<C::U>();
static constexpr size_t v_plane = L::template find_plane<C::V>();
using YP = typename L::template plane<y_plane>;
using UP = typename L::template plane<u_plane>;
using VP = typename L::template plane<v_plane>;
static constexpr size_t ppw = YP::template component_count<C::Y>();
static_assert(ppw == UP::template component_count<C::U>());
static_assert(ppw == VP::template component_count<C::V>());
// All same-tag positions share the same bit width.
static constexpr unsigned y_bits = YP::comps[YP::template find_pos<C::Y>(0)].bits;
static constexpr unsigned u_bits = UP::comps[UP::template find_pos<C::U>(0)].bits;
static constexpr unsigned v_bits = VP::comps[VP::template find_pos<C::V>(0)].bits;
static YUV16 read(const Buffer<3>& buf, size_t x, size_t y,
[[maybe_unused]] size_t W,
[[maybe_unused]] size_t H) noexcept
{
const size_t gx = x / ppw;
const size_t off = x % ppw;
const uint8_t* yp = buf.data[y_plane] + y * buf.stride[y_plane]
+ gx * YP::bytes_per_pixel;
const uint8_t* up = buf.data[u_plane] + y * buf.stride[u_plane]
+ gx * UP::bytes_per_pixel;
const uint8_t* vp = buf.data[v_plane] + y * buf.stride[v_plane]
+ gx * VP::bytes_per_pixel;
const auto y_vals = YP::unpack(detail::load_word<YP>(yp));
const auto u_vals = UP::unpack(detail::load_word<UP>(up));
const auto v_vals = VP::unpack(detail::load_word<VP>(vp));
return YUV16{
detail::decode_norm(y_bits, y_vals[YP::template find_pos<C::Y>(off)]),
detail::decode_norm(u_bits, u_vals[UP::template find_pos<C::U>(off)]),
detail::decode_norm(v_bits, v_vals[VP::template find_pos<C::V>(off)]),
uint16_t(0),
};
}
};
template <typename L>
struct MultiPixelPlanarSink {
using Layout = L;
using Pixel = YUV16;
static_assert(L::kind == ColorKind::YUV);
static_assert(L::num_planes == 3);
static_assert(L::h_sub == 1 && L::v_sub == 1);
static constexpr size_t y_plane = L::template find_plane<C::Y>();
static constexpr size_t u_plane = L::template find_plane<C::U>();
static constexpr size_t v_plane = L::template find_plane<C::V>();
using YP = typename L::template plane<y_plane>;
using UP = typename L::template plane<u_plane>;
using VP = typename L::template plane<v_plane>;
static constexpr size_t ppw = YP::template component_count<C::Y>();
static constexpr size_t y_x_idx = YP::template find_pos<C::X>();
static constexpr size_t u_x_idx = UP::template find_pos<C::X>();
static constexpr size_t v_x_idx = VP::template find_pos<C::X>();
static constexpr bool y_has_x = (y_x_idx < YP::num_comps);
static constexpr bool u_has_x = (u_x_idx < UP::num_comps);
static constexpr bool v_has_x = (v_x_idx < VP::num_comps);
static constexpr size_t block_h = 1;
static constexpr size_t block_w = ppw;
static void write_block(Buffer<3>& buf, size_t bx, size_t by,
const YUV16 (&block)[1][ppw]) noexcept
{
std::array<uint16_t, YP::num_comps> yv{};
std::array<uint16_t, UP::num_comps> uv{};
std::array<uint16_t, VP::num_comps> vv{};
// All same-tag positions share the same bit width.
constexpr unsigned y_bits = YP::comps[YP::template find_pos<C::Y>(0)].bits;
constexpr unsigned u_bits = UP::comps[UP::template find_pos<C::U>(0)].bits;
constexpr unsigned v_bits = VP::comps[VP::template find_pos<C::V>(0)].bits;
for (size_t i = 0; i < ppw; ++i) {
yv[YP::template find_pos<C::Y>(i)] =
detail::encode_norm(y_bits, block[0][i].y);
uv[UP::template find_pos<C::U>(i)] =
detail::encode_norm(u_bits, block[0][i].u);
vv[VP::template find_pos<C::V>(i)] =
detail::encode_norm(v_bits, block[0][i].v);
}
if constexpr (y_has_x) yv[y_x_idx] = 0;
if constexpr (u_has_x) uv[u_x_idx] = 0;
if constexpr (v_has_x) vv[v_x_idx] = 0;
const size_t gx = bx / ppw;
detail::store_word<YP>(
buf.data[y_plane] + by * buf.stride[y_plane]
+ gx * YP::bytes_per_pixel,
YP::pack(yv));
detail::store_word<UP>(
buf.data[u_plane] + by * buf.stride[u_plane]
+ gx * UP::bytes_per_pixel,
UP::pack(uv));
detail::store_word<VP>(
buf.data[v_plane] + by * buf.stride[v_plane]
+ gx * VP::bytes_per_pixel,
VP::pack(vv));
}
};
} // namespace pixpat
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